Steam-actuated valve.



PATENTBD JAN. 17, 1905. l o. GRSSLER.

STEAM ATUATBD VALVE.

APPLIUATION FILED JUNE ze, 1903.

s SHEETS-SHEET 1.

No. 700,100. PATENTED JAN. 17, 1905. 0. GRSSLER.

STEAM AGTUATBD VALVE.

APPLIUATION FILED JUNE 26.1903.

2 SHEETS-SHEET 2 llNTTE STaTEs Patented January 17, 1905.

PATENT OEEICE.

STEAM-ACTUATED VALVE.I

SPECIFICATION forming part of Letters Patent No. 780,100, dated January17, 1905.

Application filed June 26, 1903. Serial No. 163,272.

To n/ZZ ufl/1.0m it may cm1/cern:

Be it known that l, OswALD GEssLER, a subject of the King o1' Saxony,and a resident of 1 Quandstrasse, Leipsic-Schleussig, in the Kingdom ofSaxony, German Empire, have invented certain new and useful Improvementsin Steam-Actuated Valves, of which the fellowing is an exactspeciiication.

My invention relates to improvements in steam-actuated valves forengines without 'iiywheels, and more especially to engines possessingtwo slide-valves, one of which is moved by means of the engine itself,whereas the' other one is moved directly by means of the steam, themovement of this second slide bcing governed by means oi' the iirst one.

rlhe purpose of the invention is to provide a construction by means o'tlwhich it is attained that the moment o't' the beginning of the steamadmission, as well as the moment of closing the same--that is to say,the moment or' the beginning of the expansion o1 the samecan be changedat will, thereby creating an engine which can be easily governed.

1n order to make my invention more clear, I refer to the accompanyingdrawings, in whichw Figure 1 is a longitudinal section ol the workingparts o'lI the engine. Figs. 2 and 3 show the same parts in anotherposition. Fig. 4 shows a modiiication of the construction shown in thepreceding figures. Figs. 5 and 6 show the device for effecting that thevalves et' the pump driven by means of the engine have suflicient timeto close.

In the construction shown in Figs. 1 and E2, (t is the steam-cylinder.is a piston situated within the same. c is the piston-rod. Z (,Z are thesteaminlet ports. e e are the steam-outlet ports. nels ff2 for the steamadmission and a channelj223 for the exhaust-steam. r1`he slide-valve 'fis moved by means of a second slide-valve g, which, as may be seen fromthe drawings, is E-shaped. rl`he slide y is moved by means of theslide-valve rod y'. The slide-valve rod g is connected, by means oi. alink g2, to a lever la, connected at 7L to the piston-rod c.' Forchanging the movement et' the slide-valve g the point in which the linkg2 is connected to the lever la. may be adjusted by thc arf is aslide-valve provided with chani rangement of a slot lf. The slide gconsists, as may be seen from the drawings, of two separate parts thatis to say, the part g and the part g". These parts are both connected,by means of threads, to the slide-valve rod g in such manner that byturning this slid e-valve rod by means of a hand-wheel (shown in Fig. 1of the drawings) the distance between the parts g and ffl can bechanged.

The eliect of the device is as follows: It' steam is admitted into thevalve-chest fi, the steam will in the position shown in Fig. 1 llowthrough the part 1301i the slide y and the channels f2 and d into thecylinder t and will move the piston 7) in the direction otl the arrow.As thc slide g is connected, by means or' the valve-rod g', the link g2,and the lever to the piston-rod c, this slide-valve g will t'ollow themovement oil the piston 7). As soon as the slide g arrives in theposition shown in Fig. 2 the steam admission is cnt olli, and the steamin the cylinder t begins to expand. lt the slide y] arrives in theposition shown in Fig. 3, the steam will iiow through the part g" of theslide g into the channelf'. As this channel f is in this position withthe slide f closed on its lower side, as may be seen from Fig. 1, thesteam cannot liow into the cylinder. ln the slide f small channels f3 fiare provided, which connect the channels f/ f2 with small spaces and f.if now the steam enters the channel f', it will iow through thechannelf" into the spacef, and will consequently press the slidefto theright-hand side, so that the same adopts the position shown in Fig. 3.In this position the steam llows from the admissionchamber through thepart g" olE the slide g, the channel j", and the channel d behind thepiston and drives the same :forward in the direction of the arrow shownin Fig. 1. During this Vforward moven'ient the slide g/ moves alsoforward until the part g otl the same arrives in the position in whichthe steam can liow into the same. As soon as the steam is admitted tothe part g the steam will ilow through the channel f1 to the space f"and will bring the slide f into the position shown in Fig. 1. ll" thecylinder moves in the direction indicated by the arrow in Fig. 1, theexhaust-steam liows through the channels l and f2;i to the exhaust e',while if the piston Tool moves in the opposite direction the exhaust lnel flows through the channel d and f23 to the exhaust e. In onecylinder-engine in which the steam exhausts it is not necessary toarrange two exhaust-ports e and ef; but it is sufiicient to arrange onlyone exhaust,as shown in the modification in Fig. 4. In this modificationthe slidef is provided with bores fffs, into which pistons f f 1 arefitted. rIhe spacesfl and f, into which flows the steam for moving theslide f,are in this construction situated at `the end of the pistons fgand f1". It will be seen from the drawings that the baseplates fu and f12, as well as the ends of the slide f, are not exactly fitted into thevalvechest, but have sufiicient play for allowing an adjusting of thesame in case of the sliding' surfaces wearing out. In the constructionshown in Fig. I special cylinders fw and fu, having some play in thevalve-chest, are provided for allowing of wearing out. If the expansionshall be changed, this can be easily effected by adjusting the point inwhich the link g2 is fixed to the lever L, which changing is effected bymeans of the slot 7a2. A further changement of the admission can beattained by changing the position of the slide g by means of the screwg5.

By changing the movement of the slide g and simultaneously changing thedistance between the parts and g* of the slide g an exact adjusting ofthe expansion can take place, which was not the case in theconstructions hitherto known. The combination of these two adjusting'means therefore forms the main part of the invention.

In order to attain that the steam in the spaces f5 and f6 can escape ifthe slide f is moved a small channel f is provided. This channelconnects in the position shown in Fig. l the space f5, by means of thechannels f3 and f', the passage gf, and the channelfg, to the exhaust e.The construction is, however, such that this connection is interruptedbefore the slidef arrives in its end position, so that the steam stillcontained in the spaces ff and f6 forms a buffer for the slide f, herebyavoiding shocks in the movement of the same.

In Figs. 5 and 6 an arrangement is shown for avoiding that the pistoncan push against the cylinder-covers and for attaining that the pistonmoves slowly at the end and beginning of the stroke, which is veryimportant in case the engine is used for driving pumps, as by this meansthe valves have sufficient time to close.

As will be seen from the drawings, the ends of the admission-channels Zand d are situated in a certain distance from the cylindercovers. la Itare branch channels connected to the channels Z d', the ends of whichchannels are situated directly at the cylinder-covers. In the positionshown in Fig. 6 the piston L just closes the channel (Z. If the pistonnow moves in the direction of the arrow, the steam 1n the space Z mustfiow out through the chan- Now this channel is made so narrow that thesteam can only slowly escape, hereby effecting' that the piston movesslowly near its dead-point. In consequence hereof the valves of the pumpdriven by means of the engine have sufHcient time to close, and thepiston will never push against the cylindercover. If now the valve f hasbeen moved, the steam must at first enter through the small channel andthe backward movement of the same will therefore also begin slowly untilthe piston has passed the end of the channel d.

Having thus fully described the nature of my invention, what I desire tosecure by Letters Patent of the United States is- 1. In a steam-engine,the combination of a cylinder, a piston situated within the cylinder, aslide-valve provided with two steam-admission channels, means for movingthis slidevalve by the steam in the steam-chest, a second slide-valvesituated upon the first one, said second slide-valve consisting of twoparts, one of which is situated so as to open and close during themovement of this slide-valve one of the steam-admission channels of thelfirst slide-valve, the second part being situated so as to open andclose during the movement of the slide-valve the second steam-admissionchannel of the first slide-valve, with means for changing the distancebetween these two parts, means for moving the second slide-valve fromthe piston-rod of the'engine, and means for changing the movement of thesecond slide-valve, substantially as described and for the purpose setforth.

2. In a steam-engine, the combination of a cylinder. a piston situatedwithin the cylinder, a slide-valve provided with two steam-admissionchannels, means for moving this slidevalve by the steam in thesteam-chest, a second slide-valve situated upon the first one, saidsecond slide-valve consisting of two parts, one of which is situated soas to open and close during the movement of this slide-valve one of thesteam-admission channels of the first slide-valve, the second part beingsituated so as to open and close during the movement of the slide-valvethe second steam-admission channel of the first slide-valve, with meansfor changing the distance between these two parts, means for moving thesecond slidevalve from the piston rod of .the engine, means for changingthe movement of the second slide-valve, and means for retarding themovement of the steam-piston near the end of each stroke, substantiallyas described and for the purpose set forth.

In testimony whereof Ihave signed my name to this specification in thepresence of two subscribing witnesses.

OSVALD GRASSLER. iVitnesses:

RICHARD SCHUHMANN, GEORG ALBREGHT.

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